package chapter1.dataabstraction.exercise;

/**
 * @author quanlinlin on 2018/11/24 17:47.
 * @version 1.0
 */
public class test {

    public static void main(String[] args) {
        String s = "Hello World";
        s.toUpperCase();
        s.substring(6, 11);
        System.out.println(s);
    }
}
